To keep the leather of the buckle supple and protect it from cracking, leather grease, leather oil, or leather balm are particularly suitable. While leather grease penetrates deeply and offers strong protection against moisture and wear, leather oil is ideal for already dried-out or stiff material, as it penetrates deep into the fibers and revitalizes them. A leather balm with beeswax additionally conditions the leather, keeps it breathable, and acts as a water repellent without clogging the pores.